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scsi: arcmsr: Add driver module parameter msi_enable 

Add module parameter msi_enable so user has the option of disabling MSI
interrupts if there is a platform problem.

Signed-off-by: Ching Huang <ching2048@areca.com.tw>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ching Huang 2017-12-05 10:24:01 +08:00 committed by Martin K. Petersen
parent 852c3f3240
commit a18686eb97
1 changed files with 13 additions and 3 deletions
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16
drivers/scsi/arcmsr/arcmsr_hba.c
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@ -75,6 +75,10 @@ MODULE_DESCRIPTION("Areca ARC11xx/12xx/16xx/188x SAS/SATA RAID Controller Driver
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(ARCMSR_DRIVER_VERSION);
static int msi_enable = 1;
module_param(msi_enable, int, S_IRUGO);
MODULE_PARM_DESC(msi_enable, "Enable MSI interrupt(0 ~ 1), msi_enable=1(enable), =0(disable)");
static int host_can_queue = ARCMSR_DEFAULT_OUTSTANDING_CMD;
module_param(host_can_queue, int, S_IRUGO);
MODULE_PARM_DESC(host_can_queue, " adapter queue depth(32 ~ 1024), default is 128");
@ -831,11 +835,17 @@ arcmsr_request_irq(struct pci_dev *pdev, struct AdapterControlBlock *acb)
pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no);
flags = 0;
} else {
nvec = pci_alloc_irq_vectors(pdev, 1, 1,
PCI_IRQ_MSI | PCI_IRQ_LEGACY);
if (msi_enable == 1) {
nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
if (nvec == 1) {
dev_info(&pdev->dev, "msi enabled\n");
goto msi_int1;
}
}
nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY);
if (nvec < 1)
return FAILED;
msi_int1:
flags = IRQF_SHARED;
}